Question: What is the name of the city that Nadezha Mandelstam died in, whose sister city is Vienna?
Paraphrase: What is the title of the metropolis that Nadezha Mandelstam died in, whose sister town is Vienna?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q234765 wdt:P20 ?answer . ?answer wdt:P190 wd:Q1741}
Answer: Moscow